As seen in my Kickstarter campaign, this is the bracket I designed to hold pinballs in a pyramid shape. The campaign didn't generate enough interest to warrant higher volume production so I'm making it available through Shapeways instead.
The bracket holds 16 balls on the bottom level and, despite being only 2mm thick, puts enough horizontal tension on the balls to keep them in place when three layers of pinballs are stacked on top - nine in layer 2, four in layer 3, an one on top - for a total of 30 pinballs in the pyramid. This is a great use for old pinballs pulled from games or, you can buy new balls inexpensively at pinball-related sales sites (e.g., Big-Daddy Enterprises in the US, Johns Jukes in Canada, or PinballHeaven in Europe).
In case it is not obvious, the pinballs are not included in your order from Shapeways.